KR101732794B1 - Lens assembly for edge light type display device and display device having the same - Google Patents

Lens assembly for edge light type display device and display device having the same Download PDF

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Publication number
KR101732794B1
KR101732794B1 KR1020150079939A KR20150079939A KR101732794B1 KR 101732794 B1 KR101732794 B1 KR 101732794B1 KR 1020150079939 A KR1020150079939 A KR 1020150079939A KR 20150079939 A KR20150079939 A KR 20150079939A KR 101732794 B1 KR101732794 B1 KR 101732794B1
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South Korea
Prior art keywords
aspherical surface
light
lens
light source
lens assembly
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KR1020150079939A
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Korean (ko)
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KR20160143976A (en
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문정모
임교성
Original Assignee
희성전자 주식회사
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003—Lens or lenticular sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/04—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention relates to a lens for an edge-light type display device in which a light guide plate improved in light incidence phenomenon of a light-incoming portion is reduced by reducing a directivity angle by first to fourth aspherical surfaces to a fourth aspherical surface, and a display device including the lens.
The lens assembly according to an embodiment of the present invention is a lens assembly of a light source used in an edge light type backlight device in which a light guide plate is omitted. Wherein the lens assembly includes a first lens having a first aspherical surface and a second aspherical surface, and a second lens having a third aspherical surface and a fourth aspherical surface, wherein the first aspherical surface, The second aspherical surface, the third aspherical surface, the third aspherical surface and the fourth aspherical surface are arranged in order, the first aspherical surface, the second aspherical surface and the fourth aspherical surface are concave with respect to the light traveling direction from the light source, The aspherical surface is formed to be convex with respect to the light traveling direction from the light source.

Figure 112015054487356-pat00001

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lens assembly for an edge light type display device having a light guide plate removed, and a display device including the lens assembly.

The present invention relates to a lens assembly for an edge-light type display device in which a light guide plate is eliminated, and a display device including the lens assembly. More specifically, by reducing the directivity angle from the first aspherical surface to the fourth aspherical surface, A lens for an edge-light type display device in which a light guide plate improved in cornering phenomenon is removed, and a display device including the lens.

Flat panel displays (FPDs) are widely used in TVs, mobile phones, notebooks, and tablets, and are widely used in plasma display panels (PDPs), liquid crystal displays (LCDs) An organic light-emitting display (OLED) device, and an electrophoretic display device.

Such flat panel display devices include a display panel for displaying an image, and in the case of a liquid crystal display panel, a backlight unit for supplying light to the panel is provided because the panel itself can not generate light.

The backlight unit can be divided into an edge light type and a direct light type according to the position of a light source, and a light emitting diode (LED) is widely used as a light source.

Since the edge light type backlight unit is supplied with light from a light source disposed at the side portion, a light guide plate for converting the light from the side portion toward the display panel has been used. In recent years, a technique has been developed in which light is transmitted toward a display panel by a reflector without using a light guide plate.

FIG. 6A is a schematic cross-sectional view of a conventional edge light type display device from which a light guide plate is removed, FIG. 6B is a graph illustrating a directional angle of the LED, and FIG. 6C is a diagram illustrating a planar light distribution of the display panel of FIG.

Referring to FIG. 6A, a conventional edge light type display device 100P includes a display panel 10, optical sheets 20, a reflector 30, and a light source 40. These components are embedded in the upper cover 61 and the lower cover 62, and the display panel 10 and the optical sheets 20 are separated by the mold frame 63.

The display panel 10 is, for example, a liquid crystal display panel, and the optical sheets 20 may be formed by stacking a diffusion sheet, a prism sheet, and the like.

The reflection plate 30 is arranged to form an inner space S on the rear surface of the optical sheets 20, and the inner surface is configured to reflect incident light.

As the light source 40, an LED is used. In the edge-light type display device 100P, the light source 40 is disposed on the side surface of the display panel 10 and irradiates light toward the center portion. The light emitted from the light source 40 is directed to the display panel 10 by the reflection plate 30. Accordingly, light from the light source 40 can be supplied to the display panel 10 even if there is no light guide plate.

It is known that the LED used as the light source 40 has a smaller directivity angle than other light sources. However, referring to FIG. 6B, it can be seen that the directivity angle of the LED is about 120 degrees.

Due to the orientation angle characteristics of such an LED, a photomagnetism phenomenon occurs in the vicinity of the light source 40 as shown in FIG. 6C. That is, the light from the light source 40 does not travel far to the vicinity of the center of the panel 10, but is emitted to the outside at a portion close to the light source 40.

In order to solve such a light scattering phenomenon, a method of widening the gap between the reflection plate 30 and the optical sheets 20 has been proposed, but this makes it difficult to attain thinning of the display device itself, and such a method is difficult to adopt . In addition, the spacing between the conventional reflection plate 30 and the optical sheets 20 is maintained, and the diffusion distance of the light source 40 is insufficient, which causes a limitation in the size of the display device.

(Related Patent Literature)

Korean Patent Application No. 10-2012-0026165

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a light guide plate in which the light incidence phenomenon of the light-incident portion is improved by reducing the directivity angle by the first aspherical surface to the fourth aspheric surface. A light source for a light source for an edge light type backlight device and a display device including the lens.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a lens assembly for a light source for use in an edge light type backlight device in which a light guide plate is omitted. Wherein the lens assembly includes a first lens having a first aspherical surface and a second aspherical surface, and a second lens having a third aspherical surface and a fourth aspherical surface, wherein the first aspherical surface, The second aspherical surface, the third aspherical surface, the third aspherical surface and the fourth aspherical surface are arranged in order, the first aspherical surface, the second aspherical surface and the fourth aspherical surface are concave with respect to the light traveling direction from the light source, The aspherical surface is formed to be convex with respect to the light traveling direction from the light source.

According to another aspect of the present invention, the space between the first aspherical surface and the second aspherical surface and the space between the third aspherical surface and the fourth aspherical surface are coaxial.

According to still another aspect of the present invention, the first lens is arranged to be surrounded by the second lens.

According to an aspect of the present invention, there is provided a display device including: a display panel; Optical sheets disposed on a rear surface of the display panel; A reflective plate disposed on the back surface of the optical sheets to form an inner space together with the optical sheets, the inner space side surface being configured to reflect light; A light source disposed on a side of the display panel and arranged to irradiate light in a central portion of the display panel; And the lens assembly described above, wherein the lens assembly is disposed such that the first aspheric surface of the lens assembly faces the light source.

According to the lens assembly and the display device having the lens assembly according to the present invention, the light incidence phenomenon of the light-incident portion can be improved by reducing the directivity angle by the first aspherical surface to the fourth aspheric surface. Accordingly, even if the light guide plate is omitted, a thinned display device can be provided.

1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention.
2 is a cross-sectional view of the lens assembly of FIG.
Fig. 3A shows information simulating the optical path of the light passing through the lens assembly of Fig. 2, and Fig. 3B shows information simulating the optical path of the light of the light source without the lens.
FIG. 4 is a graph showing the orientation angles when the lens assembly of FIG. 2 is applied and when it is not.
FIG. 5A is a schematic cross-sectional view showing that the first lens and the second lens are non-coaxially arranged, and FIG. 5B is simulation data of a coaxial and non-coaxial optical path.
FIG. 6A is a schematic cross-sectional view of a conventional edge light type display device from which a light guide plate is removed, FIG. 6B is a graph showing a directional angle of the LED, and FIG. 6C is a diagram illustrating a planar light distribution on the display panel of FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

It is to be understood that elements or layers are referred to as being "on " other elements or layers, including both intervening layers or other elements directly on or in between.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

Like reference numerals refer to like elements throughout the specification.

The sizes and thicknesses of the individual components shown in the figures are shown for convenience of explanation and the present invention is not necessarily limited to the size and thickness of the components shown.

It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other partially or entirely and technically various interlocking and driving is possible as will be appreciated by those skilled in the art, It may be possible to cooperate with each other in association.

Hereinafter, a lens, which is an embodiment according to the present invention, and a display device having the same will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of a display device according to an exemplary embodiment of the present invention. FIG. 2 is a cross-sectional view of the lens assembly of FIG. 1, and FIG. 3a is a view illustrating a simulation of an optical path of light passing through the lens assembly of FIG. And FIG. 3B shows information simulating the optical path of light of the light source in which the lens assembly is not provided. 4 is a graph showing the directivity angles when the lens assembly of FIG. 2 is applied and when it is not.

1, a configuration of a display device 100 on which a lens assembly 50 according to an embodiment of the present invention is mounted will be described.

The display device 100 is an edge light type display device and includes a display panel 10, optical sheets 20, a reflector 30, a light source 40, and a lens assembly 50.

The display panel 10 is a display panel that forms an image by a driving signal of a circuit, and may be, for example, a liquid crystal display panel. The display panel 10 may include all panels that receive light from the rear and display the screen on the outside.

The optical sheets 20 may be formed by stacking a diffusion sheet, a prism sheet, or the like. In addition, any sheets for imparting any optical effect to the back light may be further stacked.

The reflection plate 30 is disposed on the rear surface of the optical sheets 20 and forms an internal space S together with the optical sheets 20. [ The surface of the reflection plate 30 is made of a material for reflecting light, and may have a function of scattering light. Accordingly, the light incident on the reflection plate 30 can be supplied to the display panel 10 through the optical sheets 20. The reflector 30 preferably has a shape that uniformly disperses light to the upper display panel 10, and may be determined by simulating the traveling direction of the light.

The light source 40 is disposed on the side of the display panel 10 and is arranged to irradiate light to the central portion of the display panel 10. [ That is, the light source 40 is arranged to irradiate light toward the internal space S. The light source 40 may be, for example, an LED. The light source 40 is fixed to the circuit board 41, and the circuit board 41 can also perform a heat radiation function of the light source 40.

The lens assembly 50 is disposed in the light irradiation direction of the light source 40. The lens assembly 50 may be integrally fixed to the light source 40 or may be fixed to the reflector 30. [ The lens assembly 50 may be fixed in various ways.

The lens assembly 50 is formed long along the periphery of the display panel 10 and may be formed integrally with one member or may be disposed discontinuously only to the portion to which the light source 40 is attached. The specific cross-sectional shape of the lens assembly 50 will be described later.

The display panel 10, the optical sheets 20, the reflector 30, the light source 40 and the lens assembly 50 are fixed by the upper cover 61, the lower cover 62 and the mold frame 63 And these configurations can be made in various known ways, and a detailed description thereof will be omitted.

Referring to Fig. 2, the cross-sectional shape of the lens assembly 50 will be described in detail.

The lens assembly 50 includes a first lens 51 and a second lens 52. The first lens 51 has a first aspherical surface 52 and a second aspherical surface 53 and the second lens 55 includes a third aspherical surface 56 and a fourth aspherical surface 57.

The first aspherical surface 52 is formed concavely with respect to the light traveling direction from the light source 40 (indicated by a dot-dash line). That is, when viewed from the outside of the light source 40. Almost all light from the light source 40 is incident on the first aspherical surface 52. Referring to FIG. 3A, the incident light is refracted while passing through the first aspherical surface 52, and is expanded to be directed to the second aspherical surface 53.

The second aspherical surface 53 is formed concave with respect to the light traveling direction like the first aspherical surface 52. The light passing through the first aspherical surface 52 is incident on the second aspherical surface 53 and the incident light passes through the second aspherical surface 53 and is directed to the second lens 55.

The third aspherical surface 56 is formed to be convex with respect to the light traveling direction. Light passing through the second aspherical surface 53 is incident on the third aspherical surface 56 and light is refracted while passing through the third aspherical surface 56 to gather the light to a certain degree inside.

The fourth aspherical surface 57 is formed concave with respect to the light traveling direction. Light passing through the third aspherical surface 56 is incident on the fourth aspherical surface 57 and light is refracted while passing through the fourth aspherical surface 57 to form a path of light parallel to the light traveling direction.

That is, the light from the light source 40 sequentially passes through the first aspherical surface 52, the second aspheric surface 53, the third aspheric surface 56, and the fourth aspheric surface 57 along the light traveling direction, do. The specific light path is shown in the simulation data of FIG.

Referring to FIG. 3A, it can be seen that most of the light is emitted toward the light advancing direction by passing through the lens assembly 50. FIG. 3B shows the light progression of the LED as the light source 40. In contrast, most of the light travels in the light traveling direction.

4, when the lens assembly 50 is applied, the directivity angle of the light is about 120 degrees, whereas the directivity angle of the light without the lens assembly 50 is about 120 degrees 10 < / RTI > That is, it is possible to greatly reduce the directivity angle of the light by the lens assembly 50, thereby allowing the light to reach the center portion of the display panel 10.

When the lens assembly 50 is applied, it is predicted that the light scattering phenomenon near the light source 40 will be largely alleviated as compared with FIG. 6C as the directing angle becomes smaller, and the light will reach the portion far from the light source 40. This predicted effect can be achieved by significantly reducing the directivity angle of the light through the lens assembly 50.

Due to such an effect, the display device 100 to which the lens assembly 50 is applied can be easily enlarged, and the thickness of the internal space S can be reduced, which is advantageous for thinning. Further, since the light guide plate is not required, the production cost can be lowered, and a higher level of thickness can be achieved.

On the other hand, the first lens 51 and the second lens 55 may be disposed coaxially or non-coaxially.

FIG. 5A is a schematic cross-sectional view showing that the first lens and the second lens are non-coaxially arranged, and FIG. 5B is simulation data of a coaxial and non-coaxial optical path.

Referring to FIG. 5A, the first lens 51 and the second lens 52 may be arranged so as not to be coaxial, that is, the optical axes are shifted. In this case, referring to FIG. 5B, the peak angle can be changed while keeping the directivity angle small (the blue line is the simulation data of the coaxial array, and the red color is the simulation data of the non-coaxial array). More specifically, it is preferable that a wide angle of the light emitted from the lens assembly 50 with respect to the shape of the reflection plate 30 of FIG. 1 forms a certain angle with the light traveling direction from the light source 40, If the distribution can be obtained, it can be realized by using the misalignment between the first lens 51 and the second lens 55 as shown in FIG. 5A.

In this case also, between the first aspherical surface 52 and the second aspherical surface 53 of the first lens 51 and between the third aspherical surface 56 and the fourth aspheric surface 57 of the second lens 55 are And is preferably coaxial. That is, the first lens 51 and the second lens 55 are preferably symmetrical.

The first lens 51 and the second lens 55 may be separate members as in the present embodiment, but the present invention is not limited thereto. It may be physically connected. That is, when the first aspherical surface to the fourth aspherical surface 52, 53, 56, 57 are located on the light path from the light source 40, the first lens 51 and the second lens 55 It is acceptable.

When the first lens 51 and the second lens 55 are formed separately from each other, it is common that the first lens 51 is surrounded by the second lens 55 as in this embodiment, But a part of the first lens 51 may protrude to the outside of the second lens 55 due to structural necessity.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10 ... Display panel 20 ... Optical sheets
30 ... Reflector 40 ... Light source
50 ... Lens assembly 51 ... The first lens
52 ... The first aspherical surface 53 ... The second aspherical surface
55 ... The second lens 56 ... The third aspherical surface
57 ... Fourth aspheric surface
100 ... The display device

Claims (4)

A lens assembly for a light source used in an edge light type backlight device in which a light guide plate is removed,
A first lens having a first aspherical surface and a second aspherical surface, and a second lens having a third aspherical surface and a fourth aspherical surface,
Wherein the first aspherical surface, the second aspherical surface, the third aspherical surface, and the fourth aspherical surface are each formed as a single curved surface,
Wherein the first aspherical surface, the second aspherical surface, the third aspherical surface, and the fourth aspherical surface are arranged in order along the light traveling direction from the light source,
The first aspherical surface, the second aspherical surface, and the fourth aspherical surface are concave with respect to the light traveling direction from the light source,
And the third aspherical surface is convexly formed with respect to the light traveling direction from the light source. The method according to claim 1,
Wherein the first aspheric surface and the second aspherical surface and the third aspherical surface and the fourth aspherical surface are coaxial. The method according to claim 1,
Wherein the first lens is disposed so as to be surrounded by the second lens. A display panel;
Optical sheets disposed on a rear surface of the display panel;
A reflective plate disposed on the back surface of the optical sheets to form an inner space together with the optical sheets, the inner space side surface being configured to reflect light;
A light source disposed on a side of the display panel and arranged to irradiate light in a central portion of the display panel; And
A lens assembly according to any one of claims 1 to 3,
Wherein the lens assembly is disposed such that the first aspherical surface of the lens assembly faces the light source.
KR1020150079939A 2015-06-05 2015-06-05 Lens assembly for edge light type display device and display device having the same KR101732794B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009043566A (en) 2007-08-08 2009-02-26 Yoshikawa Kasei Kk Lens unit for led illumination device, illumination device, and furniture
JP2011096629A (en) * 2009-10-27 2011-05-12 Samsung Electronics Co Ltd Backlight unit and display device equipped with the same
JP2013214449A (en) * 2012-04-03 2013-10-17 Yuichi Suzuki Toroidal lens and lighting device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009043566A (en) 2007-08-08 2009-02-26 Yoshikawa Kasei Kk Lens unit for led illumination device, illumination device, and furniture
JP2011096629A (en) * 2009-10-27 2011-05-12 Samsung Electronics Co Ltd Backlight unit and display device equipped with the same
JP2013214449A (en) * 2012-04-03 2013-10-17 Yuichi Suzuki Toroidal lens and lighting device

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